public The_second()

public second(){    this.InitializeComponent();    Frame frame = Window.Current.Content as Frame;    frame.Navigating += Frame_Navigating;//请求新的页面导航是发生}private void Frame_Navigating(objectsender,NavigatingCancelEventArgs e){    if (xxx参数)//参数..   {      e.Cancel = true;//是否取消   }}